1997 EFI Flame arrestor removal

Discussion in 'General Maintenance/Repair Questions' started by Capt.Will, Jan 22, 2020.

  1. Capt.Will

    Capt.Will New Member

    27
    Aug 15, 2016
    Lake St. Clair
    1997 Sea Ray 330 Sundancer
    7.4 MPI Mercruiser Inboards
    Is this removable without also removing the exhaust? It seems the flame arresting material is glued into the inner and outer shell. My intention is to clean the flame arresting material. Anyone know the procedure or solution here?

    992EC4C0-B0A3-4184-A08C-3042C3A3E3FE.jpeg
     
    randerson likes this.
  2. rumrunner

    rumrunner Member

    286
    Mar 27, 2007
    Lake St.Clair, Michigan
    1996 33 Searay Sundancer
    Mercruiser 7.4 MPI
    Manifold Gasket 1 21AUG12.jpg Hey Capt. Will,
    Best thig to do here is remove the exhaust riser and flex the exhaust hose out of the way. You need the clearance to back out the screws of the flame arrestor. The flame arrestor comes off as an assembly. Pull the flame arrestor and clean real good with Carb Cleaner, reinstall.

    You will need to replace the riser gaskets at this time as well. It’s not that big of job.
     
  3. rumrunner

    rumrunner Member

    286
    Mar 27, 2007
    Lake St.Clair, Michigan
    1996 33 Searay Sundancer
    Mercruiser 7.4 MPI
    Use the Mercury Marine "Graphite" Gaskets as mentioned in another thread.
     
  4. Sublimetime

    Sublimetime Active Member

    766
    Oct 22, 2007
    clifton nj
    420 da
    454
    For the raw water cooled and the 1/2 fresh 1/2 raw water cooled boats it is a much quicker job because you don't have to deal with draining and collecting of the anti freeze side of manifolds.
     
  5. Lakeside Attraction Ohio

    Lakeside Attraction Ohio New Member

    13
    May 21, 2016
    Lake Cumberland, KY
    1999 40' Sundancer
    454 CI Mercruiser Horizons EFI 380 HP Gas
    Capt. Will:
    I have a similar setup. To clean my flame arrestors, I spray carb cleaner on the flame arrestor while it is bolted in place while motors are running 1500rpm. Keeps them clean.
     
    scoflaw likes this.
  6. Capt.Will

    Capt.Will New Member

    27
    Aug 15, 2016
    Lake St. Clair
    1997 Sea Ray 330 Sundancer
    7.4 MPI Mercruiser Inboards
    Darn it. Was hoping you guys wouldn’t say that I had to removed the riser. But, it figures. Mercury, you suck. Thanks for all the information everyone.
     
  7. RollerCoastr

    RollerCoastr Well-Known Member

    Nov 15, 2007
    Cedar Point, OH / Miami, FL / MacRay Harbor, MI
    1997 400DA
    340HP 7.4 Mercruiser Bluewaters
    Garmin 741, 742, 8212, 24HD, Intellian I2
    1999 280BR
    Twin 250HP Merc 350 Alpha Ones
    The worst part about the job is the anger about Mercenjineerin' that it creates. Ditto for the raw water pump. I find that job goes better when I imagine that the water hoses are a Mercenjineerer's neck.

    It also helps when Crusader and VP owners keep a 300' distance until the job is done.
     
    Stee6043 likes this.
  8. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass, cape coral fl
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    That arrester doesn't collect dirt it's not an air cleaner. What was mentioned in post 5 works, unless you like taking things apart.
     
  9. Stee6043

    Stee6043 Well-Known Member

    Jun 1, 2015
    West Michigan
    1997 Sundancer 400
    7.4L Gassers
    Pure pain. These same engines two years newer did not have this design "feature". The arrestors came right off.

    Score another one for the diesel crowd. I bet they don't need to remove their exhaust to clean the filters on their turbos :)
     
  10. 370Dancer

    370Dancer Well-Known Member

    Oct 2, 2006
    Florida - Alabama
    1998 370 Sundancer
    380hp MAG MPI Gen VI with V drives
    I do it backwards. I remove the exhaust hose, or lift the intake manifold. Usually I'm doing something else too, like injectors, or IAC.
     

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